Dick
The nearest thing I have is the BJC3000 manual, these are very different in
construction but there is a description of how to time the printer mechanism.
If you want to try that please e-mail me.
Alternatively if you buy the BJC4000 manual it may have the appropriate
instructions, I don't know for sure, you could try
www.manuals4you.com and ask
the owner if the instructions are in the manual, they are very helpful.
Tony